package com.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.reggie.entity.Category;
import com.reggie.entity.Dish;
import com.reggie.entity.Setmeal;
import com.reggie.exception.CustomException;
import com.reggie.mapper.CategoryMapper;
import com.reggie.service.CategoryService;
import com.reggie.service.DishService;
import com.reggie.service.SetMealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    DishService dishService;

    @Autowired
    SetMealService setMealService;

    //    根据id删除分类,删除之前需要进行判断
    @Override
    public void remove(Long id) {
        LambdaQueryWrapper<Dish> lambdaQueryWrapper=new LambdaQueryWrapper<>();
//      根据分类id进行查询
        lambdaQueryWrapper.eq(Dish::getCategoryId,id);
        int count = dishService.count(lambdaQueryWrapper);

//       查询当前分类是否关联了菜品,如果已经关联,抛出一个业务异常
        if (count>0){
//            已经关联菜品,抛出一个业务异常
            throw new CustomException("当前分类下关联了菜品,不能删除");
        }

//        查询当前分类是否关联了套餐,如果已经关联,抛出一个业务异常
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper=new LambdaQueryWrapper<>();
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,id);
        int count2 = setMealService.count(setmealLambdaQueryWrapper);
        if (count2>0){
//             已经关联套餐,抛出一个业务异常
            throw new CustomException("当前分类下关联了套餐,不能删除");
        }

//        正常删除分类
        super.removeById(id);

    }
}
